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on Oct 17, 2020
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Zeptoseconds: New world record in short time measu...
It is worth stating this explicitly - NIST has in fact done the practical experiments to demonstrate time dilation at both 10ms⁻¹ relative velocity and 1m relative height in Earth's gravitational well:
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=90505...
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Search:
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=90505...